TTFM 1.0 Transit Time Flowmeter
for Clean Liquids


TTFM 1.0 Brochure
TTFM 1.0 User's Guide 
TTFM 1.0 Engineering Specifications
TTFM 1.0 Order Form
Application Note
Golf Course Irrigation
Two Technologies
Doppler & Transit Time
How It Works
More Information
Describe Your Application
How To Order
Greyline Product List
What's New from Greyline



New Greyline TTFM 1.0 Transit Time Flowmeter


  • Non-Contacting Clamp-on Ultrasonic Transducers

  • Works on Metal and Plastic Pipes

  • Large Backlit Flow Rate Display and Totalizer

  • Isolated 4-20mA Output

  • Built-in 5-Key Calibrator

  • 2 Programmable Control Relays

  • Optional 2 Million Point Data Logger


New - TTFM 1.0 Transit Time Flowmeter 

Accurately measure the flow rate of clean, non-aerated liquids like water, chemicals, and oils in full pipes. Ultrasonic transducers mount on the outside of a pipe without shutting down flow. Flow rate is displayed on the large, backlit display along with totalizer and signal strength. Use the built-in control relays for flow alarms or flow proportionate pulse. Connect the isolated 4-20mA output to PLC's or controllers.

The TTFM 1.0 works on a wide range of pipe sizes and materials including carbon steel, stainless steel, ductile iron, cast iron, PVC, PVDF, fiberglass, copper, brass, aluminum and pipes with bonded liners including epoxy, rubber and Teflon.

The TTFM 1.0 Transit Time Flowmeter operates by measuring the “transit time” or “time of flight” for ultrasonic sound pulses transmitted from one transducer to another. Depending on the mounting configuration, the signal may cross the pipe once, twice or four times. To measure flow the transit time is compared between ultrasonic signals travelling upstream and downstream.


  Clamp-on Ultrasonic Transducers
TTFM 1.0 Standard Features Include:
  • pair SE16B ultrasonic transducers - clamp-on for 1/2” to 48” (12 mm to 1200 mm) pipes
    and rated non-incendive for Class I, Division 2, Groups A, B, C & D locations
  • sensor cables - pair 25 ft / 7.6 m coaxial with BNC connectors
  • flow rate range: ± 0.07 to 39 ft/sec (± 0.02 to 12 m/sec)
  • installation - stainless steel transducer mounting brackets and clamps, alignment bar and silicone coupling compound kit
  • enclosure - watertight, NEMA4X (IP66) polyester and polycarbonate
  • display - white, backlit matrix
  • totalizer - 14 digits
  • calibration - built-in 5-key programmer
  • output - isolated 4-20mA (1000 ohm)
  • 2 control relays - 5 amp, SPDT - programmable for flow proportional pulse output, and/or flow alarm
  • plug-and-play options including data logger and extra control relays
  • power input - 100-240VAC 50/60Hz, 4 Watts maximum
  • electrical surge protection and RFI filters - AC, sensor, 4-20mA

View the TTFM 1.0 Transit Time Flowmeter brochure

Transducer Mounting

Watch this video demonstration of transducer installation on a PVC pipe.

Stainless steel mounting brackets, clamps and coupling compound are supplied with the instrument.

Greyline DFM 5.0 Doppler Flow Meter Greyline Doppler Flowmeters for Dirty, Aerated Liquids...

Check out the Greyline DFM 5.0 Doppler Flow Meter. It also works from the outside of metal and plastic pipes with a clamp-on ultrasonic sensor, but is designed for dirty liquids like wastewater and slurries.

Copyright © 2012-2014 [Greyline Instruments Inc.] All rights reserved.
Information in this document is subject to change without notice.